史密斯说，深红色的花青素保护着微妙的机制，它让树木从叶子里提取所需要的全部营养物。
Smith said the crimson anthocyanin protects the delicate mechanisms that allow the tree to extract all the nutrients from its leaves.
而如今开发树木作燃料的讨论与高科技密切相关，这就是从树木中提取乙醇，取代通常是从玉蜀黍（玉米）或蔗糖中提取的一种生物燃料。
But now the notion of exploiting trees for fuel is being updated with a high-tech twist. The idea is to make ethanol, a biofuel that usually comes from maize (corn) or sugar cane, from trees instead.
然而它不同于从树木或棉花中提取的用于造纸的传统纤维，它来自海藻。
It is extracted not from trees or cotton, as the cellulose used in paper is, but from algae.
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